The Roles and Weapons with the Squad

[Kiwigrunt]

Regardless of the brilliance of its ranging/fuzing system, there are at least two alternatives to the XM25. One, development of a magazine-fed semi-automatic weapon to fire 40x53mm HV ammunition from a recoilling over-the shoulder barrel. Such a weapon might have an unloaded weight with bipod up to the 12kg of the M240 MG and yet be acceptable at platoon level provided it could deliver radio and impact fuzed 240gm projectiles accurately to say at least 300m, and 900m against area targets. To reduce system weight it might be practicable to also fire LV and/or MV rounds.

This seems to fit your description fairly well except it is not over-shoulder.